摘要
采用新型A/O/A直流脱氮工艺处理焦化废水,考察了对COD和NH4+-N的去除效果。四个月的连续流试验表明,在进水COD平均为2 470 mg/L、NH4+-N为102 mg/L的条件下,系统出水COD和NH4+-N平均浓度分别为120、10 mg/L,达到了《污水综合排放标准》的二级标准。由于无回流,因而与工程上常用的A2O2工艺相比,动力消耗节省了约50%,而占地面积却仅为其1/3。前置厌氧池减轻了好氧段的负荷,改善了对COD的去除效果;出水分流则为缺氧池内的反硝化提供了较充足的碳源,避免了投加甲醇的额外花费。
The A/O/A direct-flow nitrogen removal process was used for treatment of wastewater from coking plants, and the removal efficiencies of COD and NH4^＋ -N were investigated. The 4-month continuous-flow test results show that when the influent COD and NH4^＋ -N are 2 470 mg/L and 102 mg/L, their effluent concentrations decrease to 120 mg/L and 10 mg/L respectively, meeting the secondary class criteria specified in Integrated Standard of Wastewater Discharge. Compared to the currently used A2O2 technique, the process consumes half the power and occupies one third of the space due to non-reflux. The pre-anaerobic tank reduces organic load of the aerobic phase and improves COD removal efficiency. The effluent diversion provides sufficient carbon source for denitrification in anoxic tank, avoiding the extra cost for adding methanol.
出处
《中国给水排水》
CAS
CSCD
北大核心
2008年第19期10-12,共3页
China Water & Wastewater
